SOK, S., MAM, S., & KEO, S. (2020). Capacity building of secondary school principals: A case study of the School Leadership Upgrading Program (2019-2020) at the Royal University of Phnom Penh (RUPP). Insight: Cambodia Journal of Basic and Applied Research, 2(1), 152–172. https://doi.org/10.61945/cjbar.2020.2.1.6